Abstract: The composition of articles can be identified using luminescent codes printed or coated onto the articles (or labels on the articles) by means of an ink which contains long persistence luminescent materials. Radiation is used to excite the luminescent materials and this is then extinguished before the article passes beneath a spectrometer. An infrared beam then strikes the article in order to stimulate emission from the long persistence luminescent materials, via a detrapping mechanism, and the spectrometer detects the emission in order to identify the article.

Abstract: The composition of articles can be identified using luminescent codes printed or coated onto the articles (or labels on the articles) by means of an ink which contains long persistence luminescent materials. Radiation is used to excite the luminescent materials and this is then extinguished before the article passes beneath a spectrometer. An infrared beam then strikes the article in order to stimulate emission from the long persistence luminescent materials, via a detrapping mechanism, and the spectrometer detects the emission in order to identify the article.

Abstract: There is herein described a structure for converting light from LED arrays from shorter wavelength, for example blue, into longer wavelength light, for example red and green, so as to form displays containing red, green and blue sub-pixels. More particularly, the present invention relates to a structure and process in which light from LED arrays of the same wavelength is converted into alternate colours by means of a colour conversion structure.

Abstract: A cooperative tile game played on a surface and having bifurcated tiles formed of conjoined hexagons each having an indicia of value. Play is initiated by selecting and placing one or more tiles on the surface in a three-tile triangular initial configuration. Players first exchange tiles from their hand with those in the initial configuration to achieve a predetermined set of tiles in the initial configuration. Subsequent rounds begin with a tile from the previous round. During play tiles are placed in turn such that at least one edge of a hexagonal portions is adjacent to an edge of a hexagonal portion of a previously placed tile having the same indicia of value and such that no edge of is adjacent to a side having a different indicia of value. Play proceeds until all playable tiles are placed. The value of waste tiles is subtracted from the value of created assets to achieve a score. All players achieve the same score.

Abstract: A cooperative tile game played on a surface and having bifurcated tiles formed of conjoined hexagons each having an indicia of value. Play is initiated by selecting and placing one or more tiles on the surface in a three-tile triangular initial configuration. Players first exchange tiles from their hand with those in the initial configuration to achieve a predetermined set of tiles in the initial configuration. Subsequent rounds begin with a tile from the previous round. During play tiles are placed in turn such that at least one edge of a hexagonal portions is adjacent to an edge of a hexagonal portion of a previously placed tile having the same indicia of value and such that no edge of is adjacent to a side having a different indicia of value. Play proceeds until all playable tiles are placed. The value of waste tiles is subtracted from the value of created assets to achieve a score. All players achieve the same score.

Abstract: A security article includes a security device comprising an opaque scratch removable layer (7) on and/or in which is provided a diffractive, optically variable effect generating structure (4). The scratch removable layer (7) overlies covert information (12) on the article. The security device exhibits first indicia which relate to second indicia elsewhere on the article.